Semi-dry transportation container for blue crab megalopa

Abstract

The invention discloses a blue crab megalopa semi-dry method transportation container which comprises a storage box, an upper cover is placed at the upper end of the storage box, an atomizing nozzle is installed at the bottom of an annular pipe, a liquid feeding mechanism is installed in the upper cover, and when air enters the storage box through air holes, the air can be blown to a passive mechanism installed on the upper cover, and the liquid feeding mechanism is used for feeding liquid into the storage box. The driven mechanism works to drive the rotating pipe, the circular box and the first fan blades to rotate, air in the storage box is conveyed downwards, meanwhile, the liquid conveying mechanism is driven to work, and water in the water storage tank is sprayed out through the atomization spray head. Humidity required by the megalopa can be guaranteed only by a small amount of water, oxygen injection is not needed in the transportation process, the traditional concept that the survival rate of the megalopa can be guaranteed only by water transportation and oxygen injection is broken through, sponge is used for providing attachment points, mutual damage caused by mutual embracing of the megalopa or clamping of smooth plastic films is reduced, and the survival rate of the megalopa is increased. The transportation efficiency and the survival rate are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of semi-dry transportation containers for megalopa larvae of Scylla paramamosain, and particularly relates to a semi-dry transportation container for megalopa larvae of Scylla paramamosain. Background Art

[0002] Scylla paramamosain is the marine crab species with the largest aquaculture production in China. Currently, the annual aquaculture production is about 150,000 tons. The domestic production far from meets the market demand, and about 100,000 tons still need to be imported every year. The large-scale breeding and promotion of fully artificial fry are the key issues restricting the development of the Scylla paramamosain aquaculture industry. At present, the large-scale breeding of artificial fry of Scylla paramamosain has been solved, but the supporting promotion technology system is still relatively backward. The survival rate of the metamorphosis of megalopa larvae of Scylla paramamosain into stage I zoea can reach more than 90% under suitable conditions and densities. When the density is too high, the survival rate of the metamorphosis of megalopa larvae will be less than 30%. At present, the promotion of artificial fry of Scylla paramamosain is mainly stage I or stage II zoea. More than half of the artificial fry are lost due to cannibalism in the fry breeding farm. Therefore, the promotion of megalopa larvae is one of the key issues to solve the promotion of fully artificial fry of Scylla paramamosain.

[0003] Traditional Scylla paramamosain fry mainly come from catching wild fry. For the transportation of megalopa larvae, water transportation is mainly adopted, that is, 10 - 14 kg of seawater and shelters are put into each oxygen-filled bag, oxygen is filled and climbing objects are put in, and 20,000 - 30,000 megalopa larvae are loaded into each bag. If oxygen leaks due to improper packing during the packing process, or the plastic bag breaks due to improper placement during transportation, resulting in the leakage of oxygen and water, the fry will die during transportation. This method is a method under the condition of unstable batch fry supply, with cumbersome technology, low transportation efficiency and high cost.

[0004] Secondly, Scylla paramamosain is highly aggressive. The Scylla paramamosain fry just metamorphosed from megalopa larvae have strong swimming ability. At this time, they have already grown chelipeds. When the density is high, due to the asynchrony of metamorphosis, the cannibalism of megalopa larvae is serious, and the survival rate of the metamorphosis of megalopa larvae into zoea is often less than 30%. We have found that megalopa larvae of Scylla paramamosain need suitable climbing objects such as mesh sheets to climb during the pre-metamorphosis stage. At the same time, the tolerance to environmental stress in this stage is significantly improved, and they can survive out of water for more than 48 h under suitable conditions such as humidity and temperature, which is suitable as the key artificial fry period for aquaculture promotion.

[0005] Therefore, the present application proposes a semi-dry transportation container for megalopa larvae of Scylla paramamosain. Summary of the Invention

[0006] The purpose of the present invention is to solve the above technical problems and propose a semi-dry transportation container for megalopa larvae of Scylla paramamosain.

[0007] In order to achieve the above purpose, the present invention adopts the following technical scheme: A semi-dry transportation container for megalopa larvae of Scylla serrata, comprising a storage box, an upper cover is placed on the upper end of the storage box, air holes arranged coaxially are penetrated through the storage box, a water storage tank is arranged at the inner bottom of the storage box, a sponge for covering the water storage tank is placed in the storage box, a ventilation mechanism capable of uniformly conveying air into the storage box is installed on the upper cover, the ventilation mechanism includes a bracket installed at the bottom of the upper cover, a rotating pipe rotatably arranged is penetrated through the bracket, a circular box is fixed at the bottom of the rotating pipe, a plurality of first fan blades are fixed on the outer wall of the circular box, an annular pipe communicated with the circular box is fixed at the bottom, an atomizing nozzle is installed at the bottom of the annular pipe, a liquid delivery mechanism is installed in the upper cover, when air enters the storage box through the air holes, the air will blow towards a passive mechanism installed on the upper cover, the passive mechanism works to drive the rotating pipe, the circular box and the first fan blades to rotate, convey the air in the storage box downward, and at the same time drive the liquid delivery mechanism to work, and spray the water in the water storage tank through the atomizing nozzle.

[0008] Preferably, a stacking groove is arranged at the upper end of the upper cover, a stacking block is fixed at the bottom of the storage box, and the stacking block is arranged in cooperation with the stacking groove.

[0009] Preferably, the inner wall of the sponge abuts against the inner wall of the storage box, and the sponge can completely cover the water storage tank.

[0010] Preferably, a rectangular frame is fixed at the bottom of the upper cover, and the rectangular frame slidably abuts against the inner wall of the storage box.

[0011] Preferably, the passive mechanism includes a mounting block fixed at the bottom of the upper cover, a one-way bearing is installed on the mounting block, an inner ring of the one-way bearing is in interference fit with a rotating shaft, a circular block is fixed on the rotating shaft, a plurality of second fan blades are fixed on the circular block, and the second fan blades are arranged opposite to the air holes.

[0012] Preferably, a first transmission shaft is penetrated through the bracket, a first bevel gear is fixed on the rotating pipe, a second bevel gear is fixed on the first transmission shaft, the first bevel gear is meshed with the second bevel gear, a crankshaft is installed on the first transmission shaft, a second transmission shaft is installed on the crankshaft, and the second transmission shaft is fixedly connected with the rotating shaft through a reverse mechanism.

[0013] Preferably, the reverse mechanism includes a rotating box fixedly connected with the second transmission shaft, the rotating shaft penetrates through the rotating box and is rotatably connected with it, an installation ring is fixed in the rotating box, and a spiral spring is installed on the rotating shaft and the installation ring.

[0014] Preferably, it further includes a delay mechanism. The delay mechanism includes a positioning block fixed on the rotating shaft. A fixed cylinder is fixed on the positioning block. A slider is slidably connected in the fixed cylinder. A spring is fixed between the slider and the fixed cylinder. A locking rod is fixed on the slider. A plurality of locking holes are fixed on the inner wall of the mounting ring. The locking rod is slidably connected in the locking holes. A thin hole is provided through the fixed cylinder and a short tube is fixedly penetrated through the fixed cylinder. An intake one-way valve is installed on the short tube.

[0015] Preferably, the liquid delivery mechanism includes a vertical tube penetrating through the sponge. A piston cylinder is installed at the bottom of the upper cover. A moving piston is slidably connected in the piston cylinder. A connecting rod is hinged to the bottom of the moving piston. The crankshaft penetrates through the connecting rod and is rotatably connected thereto. A liquid inlet pipe is installed on the piston cylinder. The liquid inlet pipe is inserted into the vertical tube and a liquid inlet one-way valve is installed on the liquid inlet pipe. A liquid outlet pipe is installed on the piston cylinder. A liquid outlet one-way valve is installed on the liquid outlet pipe. A rotary joint is installed on the liquid outlet pipe. The rotary joint is connected to the rotating tube.

[0016] Preferably, it further includes a power mechanism. The power mechanism includes a motor installed at the bottom of the upper cover. Transmission gears are fixed on both the rotating shaft and the output end of the motor. The two transmission gears are meshed with each other.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By using structures such as the storage box, the upper cover and the sponge, the problems of oxygen and water leakage that may occur in the traditional plastic bag transportation method are avoided, thereby reducing the mortality rate of megalopa larvae during transportation.

[0018] 2. Only a small amount of water is needed to ensure the water required for the seedlings, and they can breathe normally without oxygen supply during transportation, breaking the traditional concept that only water transportation with oxygen supply can ensure the survival rate of the seedlings.

[0019] 3. By controlling the density of megalopa larvae in the storage box and using the sponge to provide attachment points, the mutual injury caused by megalopa larvae holding each other or clamping the smooth plastic film is reduced, and the survival rate is improved.

[0020] 4. Through the design of the water storage tank and the sponge, a suitable moisture environment is provided for the megalopa larvae of mud crabs. At the same time, by using the ventilation mechanism and the liquid delivery mechanism, the air circulation and the atomized spraying of seawater are realized, ensuring the humidity and oxygen supply during transportation.

[0021] 5. The passive mechanism is driven by air flow, and then the ventilation mechanism and the liquid delivery mechanism are driven to work, realizing automatic ventilation and humidification, without the need for an additional power source, and reducing the transportation cost.

[0022] 6. The atomizing nozzle rotates along with the rotating pipe, making the spraying range of the atomized seawater wider, the spraying effect and uniformity better. At the same time, the oxygen capacity of the seawater is increased, which is beneficial to the survival of the megalopa larvae of mud crabs.

[0023] 7. After the ventilation ends, the rotating box is reversed by the action of the clockwork spring, and then drives the first fan blade to reverse, realizing the internal circulation of the air in the storage box, redistributing the oxygen, and humidifying the megalopa larvae of mud crabs again, ensuring the survival rate.

[0024] 8. Driven by the motor and the transmission gear to rotate, this can ensure the stable rotation of the second fan blade to ensure the stability of subsequent ventilation; the rotation of the second fan blade can transport air into the storage box, accelerating the air circulation, which is beneficial to the rapid ventilation in each storage box.

[0025] In summary, the present invention only needs a small amount of water to ensure the water required for the seedlings, and can breathe normally without oxygen supply during transportation, breaking the traditional concept that only water transportation with oxygen supply can ensure the survival rate of the seedlings. By using the sponge to provide an attachment point, the mutual injury caused by the megalopa larvae holding each other or clamping the smooth plastic film is reduced, and the survival rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 1 is a schematic structural view of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 2 FIG. 2 is a side view of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 3 FIG. 3 is an exploded view of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 4 FIG. 4 is a schematic view of the bottom of the upper cover of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 5 FIG. 5 is a schematic view of the second fan blade of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 6 FIG. 6 is a schematic structural view of the first fan blade of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 7 FIG. 7 is a schematic structural view of the piston cylinder of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 8 FIG. 8 is a schematic structural view of the rotating box of a semi-dry transportation container for megalopa larvae of mud crabs proposed in Embodiment 1 of the present invention; Figure 9Schematic structural diagram of a fixing cylinder in a semi-dry transportation container for megalopa larvae of Scylla serrata proposed in Embodiment 1 of the present invention; Figure 10 Schematic structural diagram of a semi-dry transportation container for megalopa larvae of Scylla serrata proposed in Embodiment 2 of the present invention.

[0027] In the figure: 1 storage box, 2 air holes, 3 upper cover, 4 stacking groove, 5 stacking block, 6 water storage tank, 7 sponge, 8 rectangular frame, 9 vertical pipe, 10 support, 11 liquid outlet pipe, 12 rotary joint, 13 rotating pipe, 14 circular box, 15 first fan blade, 16 first bevel gear, 17 second bevel gear, 18 first transmission shaft, 19 crankshaft, 20 second transmission shaft, 21 mounting block, 22 rotating box, 23 liquid inlet pipe, 24 piston cylinder, 25 circular block, 26 second fan blade, 27 liquid outlet check valve, 28 moving piston, 29 connecting rod, 30 annular pipe, 31 atomizing nozzle, 32 one-way bearing, 33 rotating shaft, 34 hairspring, 35 mounting ring, 36 lock hole, 37 positioning block, 38 fixing cylinder, 39 slider, 40 spring, 41 fine hole, 42 lock rod, 43 short pipe, 44 intake check valve, 45 motor, 46 transmission gear, 47 liquid inlet check valve. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] Embodiment 1 Referring to Figures 1-9 , a semi-dry transportation container for megalopa larvae of Scylla serrata includes a storage box 1. An upper cover 3 is placed on the upper end of the storage box 1. A rectangular frame 8 is fixed to the bottom of the upper cover 3. The rectangular frame 8 is in sliding contact with the inner wall of the storage box 1. The upper cover 3 can be fixed to the storage box 1 through a buckle. Due to the setting of the rectangular frame 8, the upper cover 3 can be limited in position and is not easily moved horizontally.

[0030] The storage box 1 is provided with coaxially arranged air holes 2 penetrating through it. A water storage tank 6 is provided at the inner bottom of the storage box 1. A sponge 7 covering the water storage tank 6 is placed in the storage box 1. The inner wall of the sponge 7 is in contact with the inner wall of the storage box 1, and the sponge 7 can completely cover the water storage tank 6. An appropriate amount of seawater can be stored in the water storage tank 6.

[0031] Among them, one side of the storage box 1 is provided with a through drainage hole, and the drainage hole is sealed by a plug. During actual operation, prepare an appropriate amount of seawater with a salinity close to that of the fry pond. Immerse the sponge completely in the seawater to absorb water, and then lay the sponge flat on the bottom of the storage box 1. Scoop up the megalopa larvae in the attachment stage, randomly weigh 1 g, calculate the number of fry in 1 g, and then weigh the weight required for 2000 fry and put it into the prepared storage box 1. Add an appropriate amount of seawater so that the fry can swim in the water. After the megalopa larvae are completely dispersed, remove the plug, drain the excess seawater from the drainage hole. At this time, the fry are evenly dispersed on the sponge 7, and then tightly plug the plug.

[0032] Since the upper end of the upper cover 3 is provided with a stacking groove 4, and the bottom of the storage box 1 is fixed with a stacking block 5. The stacking block 5 is arranged in cooperation with the stacking groove 4 so that the upper and lower storage boxes 1 can be stacked. After stacking, the air holes 2 on the horizontally opposite storage boxes 1 are arranged opposite to each other, that is, the horizontally arranged storage boxes 1 can be connected. Stack the storage boxes 1 containing the megalopa larvae up and down, with ten boxes in a stack. During transportation, turn on the air conditioner to prevent the fry from dying due to too high temperature.

[0033] An air exchange mechanism capable of evenly delivering air into the storage box 1 is installed on the upper cover 3. The air exchange mechanism includes a bracket 10 installed at the bottom of the upper cover 3. A rotatable rotating tube 13 is provided through the bracket 10. A circular box 14 is fixed to the bottom of the rotating tube 13. A plurality of first fan blades 15 are fixed to the outer wall of the circular box 14, and an annular tube 30 communicating with the circular box 14 is fixed to the bottom. A mist spray head 31 is installed at the bottom of the annular tube 30.

[0034] A liquid delivery mechanism is installed in the upper cover 3. The liquid delivery mechanism includes a vertical tube 9 penetrating through the sponge 7. A piston cylinder 24 is installed at the bottom of the upper cover 3. A moving piston 28 is slidably connected in the piston cylinder 24. The bottom of the moving piston 28 is hinged to a connecting rod 29. A crankshaft 19 penetrates through the connecting rod 29 and is rotatably connected to it. A liquid inlet pipe 23 is installed on the piston cylinder 24. The liquid inlet pipe 23 is inserted into the vertical tube 9 and a liquid inlet one-way valve 47 is installed on the liquid inlet pipe 23. The liquid inlet one-way valve 47 only allows seawater to enter the piston cylinder 24 through the liquid inlet pipe 23. A liquid outlet pipe 11 is installed on the piston cylinder 24. A liquid outlet one-way valve 27 is installed on the liquid outlet pipe 11. The liquid outlet one-way valve 27 only allows the seawater in the piston cylinder 24 to flow into the liquid outlet pipe 11. A rotary joint 12 is installed on the liquid outlet pipe 11. The rotary joint 12 is connected to the rotating tube 13.

[0035] When air enters the storage box 1 through the air holes 2, the air will blow towards the passive mechanism installed on the upper cover 3. The passive mechanism includes a mounting block 21 fixed to the bottom of the upper cover 3. A one-way bearing 32 is installed on the mounting block 21. The inner ring of the one-way bearing 32 is in interference fit with a rotating shaft 33. A circular block 25 is fixed on the rotating shaft 33. A plurality of second fan blades 26 are fixed on the circular block 25. The second fan blades 26 are arranged opposite to the air holes 2.

[0036] The operation of the passive mechanism can drive the rotation of the rotating tube 13, the circular box 14, and the first fan blade 15, convey the air in the storage box 1 downward, and at the same time drive the liquid delivery mechanism to work, spraying the water in the water storage tank 6 through the atomizing nozzle 31.

[0037] A first transmission shaft 18 penetrates through the bracket 10. A first bevel gear 16 is fixed on the rotating tube 13. A second bevel gear 17 is fixed on the first transmission shaft 18. The first bevel gear 16 meshes with the second bevel gear 17. A crankshaft 19 is installed on the first transmission shaft 18. A second transmission shaft 20 is installed on the crankshaft 19. The second transmission shaft 20 is fixedly connected to the rotating shaft 33 through a reverse mechanism. The reverse mechanism includes a rotating box 22 fixedly connected to the second transmission shaft 20. The rotating shaft 33 penetrates through the rotating box 22 and is rotatably connected thereto. A mounting ring 35 is fixed in the rotating box 22. A hairspring 34 is installed on the rotating shaft 33 and the mounting ring 35.

[0038] It further includes a delay mechanism. The delay mechanism includes a positioning block 37 fixed on the rotating shaft 33. A fixing cylinder 38 is fixed on the positioning block 37. A slider 39 is slidably connected in the fixing cylinder 38. A spring 40 is fixed on the slider 39 and the fixing cylinder 38. A locking rod 42 is fixed on the slider 39. A plurality of locking holes 36 are fixed on the inner wall of the mounting ring 35. The locking rod 42 is slidably connected in the locking holes 36. A fine hole 41 penetrates through the fixing cylinder 38 and a short tube 43 is fixedly penetrated. An intake check valve 44 is installed on the short tube 43. The inner diameter of the short tube 43 is larger than the inner diameter of the fine hole 41.

[0039] When the present invention is in use, after the storage boxes 1 are stacked, an exhaust hood is installed in the carriage. The exhaust hood is opposite to the stacked storage boxes 1. The fan works to discharge the air through the exhaust hood, and the air enters the storage box 1 through the air holes 2. Since the horizontally opposite storage boxes 1 are connected, when the air holes 2 on the front - side entire storage box 1 can all enter air, the rear - side storage box 1 can also enter air.

[0040] When air enters the storage box 1 through the air hole 2, the air blows onto the second fan blade 26, thereby driving the second fan blade 26, the circular block 25, and the rotating shaft 33 to rotate. The rotating shaft 33 drives the clockwork spring 34 to move, causing the clockwork spring 34 to tighten. When the clockwork spring 34 tightens to a certain torque, the rotating shaft 33 drives the rotating box 22 and the second transmission shaft 20 to rotate. During this process, the rotational speed of the rotating shaft 33 gradually decreases, and the rotating shaft 33 rotates synchronously with the second transmission shaft 20.

[0041] The rotation of the rotating shaft 33 drives the positioning block 37, the fixed cylinder 38, and the locking rod 42 to rotate. Under the action of centrifugal force, the locking rod 42 and the slider 39 move. When the centrifugal force received by the locking rod 42 and the slider 39 is greater than the elastic force of the spring 40, the spring 40 is stretched. At this time, the locking rod 42 and the slider 39 move, and finally the locking rod 42 is caught in the locking hole 36.

[0042] During the movement of the slider 39, a negative pressure appears in the fixed cylinder 38, and the negative pressure causes the intake check valve 44 to open. Air enters the fixed cylinder 38 through the short pipe 43 and the intake check valve 44.

[0043] The rotation of the second transmission shaft 20 drives the crankshaft 19 and the first transmission shaft 18 to rotate. The rotation of the first transmission shaft 18 drives the second bevel gear 17 to rotate. The rotation of the second bevel gear 17 drives the first bevel gear 16 to rotate, thereby realizing the rotation of the rotating pipe 13. The rotation of the rotating pipe 13 drives the circular box 14, the annular pipe 30, and the first fan blade 15 to rotate. The rotation of the first fan blade 15 can convey the air below upward and finally discharge it from the air hole 2 on the other side. The intake end of the air hole 2 flows into the storage box 1, realizing the air flow in the storage box 1, and further providing air to the storage box 1 for the breathing of the megalopa of the mud crab.

[0044] The rotation of the crankshaft 19 drives the connecting rod 29 to move. The movement of the connecting rod 29 drives the moving piston 28 to move up and down. When the moving piston 28 moves downward, the piston cylinder 24 is in a negative pressure state. At this time, the intake check valve 47 opens, so that the seawater in the water storage tank 6 can be sucked into the piston cylinder 24 through the vertical pipe 9 and the liquid inlet pipe 23. When the moving piston 28 moves upward, the moving piston 28 squeezes the water in the piston cylinder 24. The piston cylinder 24 is in a high-pressure state, and the outlet check valve 27 opens. The seawater is conveyed into the rotating pipe 13 through the liquid outlet pipe 11 and the rotary joint 12, and finally conveyed into the circular box 14 and the annular pipe 30, and finally sprayed out through the atomizing nozzle 31. The sprayed atomized seawater falls on the sponge 7, which can humidify the megalopa of the mud crab, ensuring that the parts of the megalopa of the mud crab that do not contact the sponge 7 can also remain moist, ensuring the survival rate of the megalopa of the mud crab.

[0045] When the atomized seawater passes through the flowing air, the oxygen capacity of the seawater can be increased, thereby oxygenating the seawater. The oxygenated seawater falls on the megalopa larvae of the mud crab, which is beneficial to the survival of the megalopa larvae of the mud crab and ensures the survival rate during transportation.

[0046] Since the atomizing nozzle 31 rotates with the rotating tube 13, the atomized seawater is sprayed over a wider range, and the spraying effect and uniformity are better.

[0047] After a period of time, after the air exchange in all the storage boxes 1 is completed, under the action of the clockwork spring 34, the rotating shaft 33 rotates in reverse. Under the action of the one-way bearing 32, the rotating shaft 33 is locked and cannot rotate. At this time, the locking rod 42 is located in the locking hole 36, so that the rotating box 22 is locked together with the rotating shaft 33, that is, the second transmission shaft 20 also cannot rotate.

[0048] Since the rotating box 22 is in a static state, under the action of the spring 40, the slider 39 and the locking rod 42 are reset. The slider 39 moves to squeeze the air in the fixed cylinder 38, and the air slowly discharges through the fine holes 41, so as to delay the reset of the clockwork spring 34.

[0049] As the slider 39 is reset, the locking rod 42 disengages from the locking hole 36. At this time, the rotating box 22 is not locked together with the rotating shaft 33. Under the action of the clockwork spring 34, the rotating box 22 rotates in reverse, thereby driving the second transmission shaft 20 to rotate in reverse. Through transmission, the first fan blade 15 rotates in reverse. The rotation of the first fan blade 15 can convey the upper air downward, so as to realize the internal air circulation in the storage box 1, redistribute the oxygen in the storage box 1. At the same time, the atomizing nozzle 31 sprays seawater, which can humidify the megalopa larvae of the mud crab again, ensuring that the parts of the megalopa larvae of the mud crab that do not contact the sponge 7 can also remain moist, ensuring the survival rate of the megalopa larvae of the mud crab.

[0050] In this way, when the exhaust hood exhausts and exchanges air again, the above steps are repeated.

[0051] Embodiment 2 Refer to Figure 10 , the difference between this embodiment and Embodiment 1 is that this embodiment further includes a power mechanism. The power mechanism includes a motor 45 installed at the bottom of the upper cover 3. Transmission gears 46 are fixed to the output ends of the rotating shaft 33 and the motor 45, and the two transmission gears 46 are meshed with each other; changing the rotation of the second fan blade 26 driven by air in Embodiment 1 to the rotation driven by the motor 45 and the transmission gears 46, so as to ensure that the second fan blade 26 can rotate stably to ensure the stability of subsequent air exchange.

[0052] The rotation of the second fan blade 26 can convey air into the storage box 1, accelerate the air circulation, and is beneficial to the rapid air exchange in each storage box 1.

[0053] Through the simulated transportation experiment of megalopa larvae on the third day, it was found that under the condition of a temperature of 25°C, when the megalopa larvae were completely out of the water environment, they would all die within 2 hours; if the megalopa larvae were attached to the net and suspended above the water, the survival rate of the megalopa larvae was 96% within 2 hours, 74% within 4 hours, and all died after 6 hours; under the conditions of a temperature of 25°C and a salinity of 17‰, the survival rate of the megalopa larvae reached 97.14% at 12 hours, 94.28% at 24 hours, and 91.42% at 48 hours; the survival rate of the megalopa larvae on the fourth day was 91.83% at 24 hours and 87.75% at 48 hours; and after the megalopa larvae after the experiment were put back into the water, the metamorphosis rate of the megalopa larvae reached 76.74% at 48 hours, and only a very small number of individuals failed to completely metamorphose into juvenile crabs within 48 hours. The specific data is as follows: Dry transportation of megalopa larvae on the third day and experimental results of the transportation of the present invention

[0054] Transportation results of megalopa larvae on the third and fourth days by the present invention

[0055] Metamorphosis quantity of megalopa larvae after transportation on the fourth day

[0056] As mentioned above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A semi-dry transportation container for megalopa larvae of Scylla serrata, comprising a storage box (1), and an upper cover (3) is placed on the upper end of the storage box (1), characterized in that, The storage box (1) is provided with coaxially arranged air holes (2) running through it. The inner bottom of the storage box (1) is provided with a water storage tank (6). A sponge (7) that covers the water storage tank (6) is placed inside the storage box (1). An air exchange mechanism capable of evenly delivering air into the storage box (1) is installed on the upper cover (3). The air exchange mechanism includes a bracket (10) installed at the bottom of the upper cover (3). A rotatably arranged rotating tube (13) runs through the bracket (10). A circular box (14) is fixed to the bottom of the rotating tube (13). A plurality of first fan blades (15) are fixed to the outer wall of the circular box (14), and an annular tube (30) communicating with the circular box (14) is fixed to the bottom. An atomizing nozzle (31) is installed at the bottom of the annular tube (30). A liquid delivery mechanism is installed inside the upper cover (3). When air enters the storage box (1) through the air holes (2), the air blows against a passive mechanism installed on the upper cover (3). The passive mechanism can drive the rotation of the rotating tube (13), the circular box (14), and the first fan blades (15) to deliver the air inside the storage box (1) downward, and at the same time drive the liquid delivery mechanism to work, spraying the water in the water storage tank (6) through the atomizing nozzle (31).

2. The semi-dry transportation container for swimming crab zoea according to claim 1, wherein A stacking groove (4) is provided at the upper end of the upper cover (3). A stacking block (5) is fixed to the bottom of the storage box (1). The stacking block (5) is arranged in cooperation with the stacking groove (4).

3. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 1, characterized in that, The inner wall of the sponge (7) abuts against the inner wall of the storage box (1), and the sponge (7) can completely cover the water storage tank (6).

4. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 1, characterized in that, A rectangular frame (8) is fixed to the bottom of the upper cover (3). The rectangular frame (8) slidably abuts against the inner wall of the storage box (1).

5. A semi-dry transportation container for swimming crab zoea according to claim 1, characterized in that, The passive mechanism includes a mounting block (21) fixed to the bottom of the upper cover (3). A one-way bearing (32) is installed on the mounting block (21). The inner ring of the one-way bearing (32) is in interference fit with a rotating shaft (33). A circular block (25) is fixed to the rotating shaft (33). A plurality of second fan blades (26) are fixed to the circular block (25). The second fan blades (26) are arranged opposite to the air holes (2).

6. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 5, characterized in that, A first transmission shaft (18) runs through the bracket (10). A first bevel gear (16) is fixed to the rotating tube (13). A second bevel gear (17) is fixed to the first transmission shaft (18). The first bevel gear (16) meshes with the second bevel gear (17). A crankshaft (19) is installed on the first transmission shaft (18). A second transmission shaft (20) is installed on the crankshaft (19). The second transmission shaft (20) is fixedly connected to the rotating shaft (33) through a reverse mechanism.

7. A semi-dry transportation container for megalopa larvae of mud crabs according to claim 6, characterized in that, The reverse mechanism includes a rotating box (22) fixedly connected to the second transmission shaft (20). The rotating shaft (33) runs through the rotating box (22) and is rotatably connected to it. A mounting ring (35) is fixed inside the rotating box (22). A clockwork spring (34) is installed between the rotating shaft (33) and the mounting ring (35).

8. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 7, characterized in that, It further includes a delay mechanism. The delay mechanism includes a positioning block (37) fixed on the rotating shaft (33). A fixed cylinder (38) is fixed on the positioning block (37). A slider (39) is slidably connected in the fixed cylinder (38). A spring (40) is fixed between the slider (39) and the fixed cylinder (38). A locking rod (42) is fixed on the slider (39). A plurality of locking holes (36) are fixed on the inner wall of the mounting ring (35). The locking rod (42) is slidably connected in the locking holes (36). A fine hole (41) is provided through the fixed cylinder (38), and a short tube (43) is fixedly penetrated on the fixed cylinder (38). An intake check valve (44) is installed on the short tube (43).

9. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 7, characterized in that, The liquid delivery mechanism includes a vertical tube (9) penetrating through the sponge (7). A piston cylinder (24) is installed at the bottom of the upper cover (3). A moving piston (28) is slidably connected in the piston cylinder (24). A connecting rod (29) is hinged to the bottom of the moving piston (28). The crankshaft (19) penetrates through the connecting rod (29) and is rotatably connected thereto. A liquid inlet pipe (23) is installed on the piston cylinder (24). The liquid inlet pipe (23) is inserted into the vertical tube (9), and a liquid inlet check valve (47) is installed on the liquid inlet pipe (23). A liquid outlet pipe (11) is installed on the piston cylinder (24). A liquid outlet check valve (27) is installed on the liquid outlet pipe (11). A rotary joint (12) is installed on the liquid outlet pipe (11). The rotary joint (12) is connected to the rotating tube (13).

10. A semi-dry transportation container for megalopa larvae of Scylla serrata according to claim 5, characterized in that, It further includes a power mechanism. The power mechanism includes a motor (45) installed at the bottom of the upper cover (3). Transmission gears (46) are fixed to the output ends of the rotating shaft (33) and the motor (45). The two transmission gears (46) are meshed with each other.

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